Trimming mechanism for sewing machines



NOV- 28, 1933- i H. E. sMALLBoNE l TRIMMING MECHANISM FOR SEWINGMACHINES Filed June 9, 1932 2 sheets-sheet 1 i Figuur 3'1- "5 ZSnvenforattorney/J NOV. 28, H. E SMALLBONE TRIMMING MECHANISM FOR SEWINGMACHINES Snventor Gttorneg/J Patented Nov. 28, 19.33

f ingaan l TRIMMrNc MEcHANi'sM For: SEWING MACHINES v y Harry E.Smallbone, New York, N. Y., assigner to Willcox 8GibbsSewingfMachine'Colnpany,

New York, N. Y., =a corporation of` New `York 'Application :une 9,19.32. serial! No. 616,330 i' 6 claims. (Grillz- 125) This inventionrelates to trimming mechanism for sewing machines and especially tosuchmechanism designed for use in conjunction with a binder in thewell-known lock-stitch machine of theWillcoX & Gibbs Sewing MachineCompany to constitute a lock-stitch trimming and bindingy machine. f

The principal object is to provide a trimming mechanism of efiicient,simple and relatively in-r expensive construction, Whereof thereciprocating bar carrying the movable trimmer blade may be readilylocked to its driving connections to be actuated thereby, ordetachedfrom said driving connections and locked to a fixed part of the machineto thereby locate the movable trimmer blade and its associated parts inan out-of-the way position when trimming of the work is not desired-This and other objects and advantages which will be apparent fromfthefollowing detailed description, are realized by the embodiment of theinvention illustrated in the accompanying drawings wherein- Fig. 1 is afront elevation of the left-hand end of the machine showing the needlepart Way vup and the trimmer latch engaged with driving con-V nectionswhich actuate the movable trimmer b ar and its blade;

Fig. 2 is a similar view,'but with the trimmer bar and its blade lockedin an elevated out-of-theway position by engagement of thelatch with alXed part or keeper on the machine frame;

Fig. 3 is an Fig. 8` is a perspective Vview jshowing*the latchV engagedwith its Xed part yor keeper on the Referring to the drawings, 20 iscthe.machine base having supporting legs such as 21 (Fig. 3) .2 2 is theneedle-hole plate having therethrough needle-hole 23 (shown in dottedlines in Fig. 3)

as well as slots 24 through which rows of teeth` of the'four-motion feeddog 25 operate in the' usual way to engage and feed the work. An openingthrough the top plate of the machine base 20, such as usually providedto aord access to the mechanism beneath, is closed by the .usual slideplate `26 (Figs. 1 and 3). 27 is an upstanding 'the fabric edge whichisto loe-trimmed before; la binding lisapplied and vsecuredAvstitchfforming mechanism.

yrigs.V llana 4.

end elevation fromV the leftf of the latch respectively;

edge guide" secured Yto or formed'.ntegraillywitha plate 28. Screws 29passingthrough a slot in plate 28 `adjustably secure `said guide 27inthe desired positionto guide to the trimmer` blades 2.60 thereto byvthe 35,is Lan-opening lthrough the base platei20 and stationary trimmer'blade adjustable. in a Lat'the right Vofthe forwardY end ofneedle plate22, as shown in section in Fig. 2. 37 is the' lower,

groove 36 (Fig. 3) inthe face of` any upright plate 38, the, latterbeing rigidly supported f rirntl'iev .base plate 20 in a manner which itisunnecessary g isecured to the under 'side of base'plate 20 'byf a` vtohere describe.` A piece othinsheet metaL; bent to iorm a rear wall -39andja -side Wall 40,v is

bracket member 41 (Fig. 2) Saidwalls 39 `and 40 together with plate 38constitute a troughlike `conduit for receiving trimmings of fabric movedby the. trimmer blade'. I a 50 is a part of theouter end ofthearm ofthesewing machine frame to whichthe hollow head 51 of the machine 'issecured by threescrews 52, 53 is the maindriving shaftextending"horizontallythrough arm750 intogheadj,A 51 where it carries a trimmerbar driving eccenf tric 54 `I(Fig. 4)', a needle-bar'driving crank 55(Fig. 3)"and a block 56, which latter rotates in and ,projects slightlyfrom anopeningl in the. wall of the machinek head 5l. A ro-taryftake-up,notshown, is4 secured to block 56 by a screw 58 land aldowel pin'59.

f 60is the'V needle bar carryingxneedle 61 at. its

'lowerxend and driven from thecrank pin 62' on "crank 55by pitinan 63which at' itsupper `end pivotall'yv engages vsaid -pin and at its'lowerendv is yconnected byy a pivot screw 64 to a vertically movable slide 65which latter 'at` one end is clamped to the needle bar 60 and atA itsotherendI slides on the presser-foot bar next mentioned. f

66' is the presser-foot bar carrying presser-foot 'fpositioned tooverlie' the needle-hole plate 22 f andpar-,ticularly the slottedportions thereof through which the rows of teeth of the feed mem# Y bei'operate.l The usual presserffoot liftinglever 68 is shown in Fig. 3. i

V"Moredetailed description and illustration of these parts of themechanism is unnecessary.

"1A trimmer bar 70, vertically movable in upper'v head 5 1, carries atits lower" end a verticallyjreciprocating trimmer blade '73,adju'staloly clamped in placeby a clamp' plate '7 4 secured by `a screw'75, and a trimmings deflector plate 76 secured bearing 71 and lowerbearing 72 `on the'machine y is a trimmer-bar actuating member inthe.

form of a sleeve embracing and freely slidable upon trimmer bar '70below its upper bearing 71. The enlarged lower end of sleeve 80 has aprojectof ball formation. During therunning of the 15 machine, sleeve 80is constantly VreciprocatedV ver-A tically on trimmer bar 70 by alever.86 (Fig. 4) fulcrumed at one end onthe machine frame by a screwYstud 87, at'its other end embracing the spherical portion of the stud85, and at its middlev 20 embracing the eccentric 5e of the main shaftand being actuated thereby through the intermediary of upper andlower'bearing blocks 88; 88, slidable ,i in an opening in theieverclosed at itstop by a cap plate 89.

Y A xed latch-member in the form of an upright bar 90, secured to themachine head by the screwsl 91, is curved at its upper end andtermihates in a right angle extension 9 2 which constitutes a keeperadapted to be engaged by a latch next described.

Vforming a shoulder at 100. A latch support 101 embraces bar 70immediately aboveand in conf (Fig. 5) so that it may be contracted by ascrew 103 and thus clamped tightlyv to the bar.r An rextension 104 fromsupport 101 engages Vthe aforesaid guiding slot 93 and thusprevents'turnfing of the trimmer bar on its axis during its verticalreciprocation.l Another extension 105 from support 101 has a circularextremity with a milled @top or gripping-surface.

' lA latch generally/in the form of a -bell crank,l

lever is best shown in Fig. 7. It comprises an up- Y rightarm 106,terminating at its upper'e'nd in a bent over extremity 107 adapted toengage either.

' Ythe notchSS of thel sleeve 80, or over the upper -fedge of extensionor keeper 92, and a horizontal. arm 108 terminating in a circularpart109`hav-M ving a milled bottom surface for gripping purposes. At.its middle said latch spans the latch 82 of thevsleeve 80. Acoiledspring 112 is interposed between rthe `circular extremitiesof theextension 105 and arm 108 ofthe latch andtends to engage the latter inlocking position.; either .450 with the notch 83 of the reciprocatingtrimmer sired to trim fabric-edges, the endr .10.7 of the 4latch" 65Y isengaged with notch 83 (as shown' in Fig. l) Aand' so held by Yspring112,- whereby the. reciprocations of sleeve 80 are imparted through saidlatchY to the trimmer bar 70 and its movable trimmer On the other hand,When trimming of fabric is not required, the circular ends of x'ed blade'73.

f extension 105l and arm 108 of the latch lever are 4,gripped betweenthe thumb and ringer and forced together against the pressure of spring112 until @the latch .is disengaged from notch 88 .of the ing `guidenger `82 (Figs. 2 and 6), a transverse notch or groove 83 above saidfinger, and an ear. or lug'84 intowhich kis screwed a pivot stud 85lmovable trimmer blades; a reciprocatory trimmer-bar carrying saidmovable blade; an actuat- `merbar carrying saidmovable blade; an'aCtuat-Y ber, or for connecting oarv to and discon- The lower portion of thetrimmer bar 70 is ofk larger diameter than its upper portion, thereby 1prising in combination, cooperating fixed and tact with saidshoulder'loll and is splitat 102' trimmer sleeve. yThen the latchmechanism and along with it theparts ati the lowerend thereof (includingthe movable trimmer blade 73) are slid upward untily thelatch is engagedwith its keeper 92 withall' of the parts in the position 80 ,shown inFigs. 2 and 3.' yIn this .manner the Vmovable trimmer blade-andassociated parts may be quickly elevatedrto and locked inanoutof-the-way position when trimming is not required. The procedurecan be quickly reversed when trimming is desired.. n Y

Whatv is claimed as new isy 1. Sewing machine trimming'mechanismcomprising in combination, cooperatingv fixed and v prising inAcombination,Y cooperating -ixed and movable trimmer blades;areciprocatory triming member for said trimmer-bar and, slidablethereon; and means carried by said trimmerbar and movable for eitherconnecting said bar to or disconnecting it from said actuatingmemnecting it from al fixed partof the machine.

3. Sewing machine trimming mechanismcommovable trimmer blades; 'areciprocatory. trimv mer-.bar carrying said movable blade; an actuat-110 ing member .for said trimmer-bar and slidableY thereon; and a latchcarried by said trimmer-bar for either connecting or disconnectingsaidbar and actuating member.. u

4. Sewing .machine trimming mechanism comprising inV combination,cooperating iixed [and movable trimmer blades; a reciprocatorytrimmer-bar carrying said movable blade; an actuating member "for Ysaidtrimmer-barY and slidable thereon; vand a latch for eitherconnectingsaid trimmer bar to said actuating .,member or connecting it to a fixedpart of the machine out ,of action. Y

5. Sewing machine 'trimming mechanism comprising inv combination,cooperating Xed and Yv ractuating member to impart movementl ofy thelatter to the bar, or to engage a'ixed part ofthe machine andtherebyholdthe trimmer-bar out of action. l I o '6. Sewing machine trimmingmechanism .comprising in combination, cooperating xedfand Ymovabletrimmer blades; .a reciprocatory'trimmer-bar carryingsaid'niovableblade; an actuating isleeve for saidlbar. and slidable thereon; a latchcarrier secured to said bar; `and a spring actuatedlatchpivotallymounted on vsaidlatch rcarrier and acting toerigage' eithersaid actuating sleeve to impart movement therefrom to the trimmer-bar,.or .to engage ahmed-part ofjthe machine and thereby'hold! thetrimmerf-barfout of actionpfl 1 -HARRY- SMALLBONE.

